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| Titel |
Dynamics of resource production and utilisation in two-component biosphere-human and terrestrial carbon systems |
| VerfasserIn |
M. R. Raupach |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 11, no. 2 ; Nr. 11, no. 2 (2007-02-21), S.875-889 |
| Datensatznummer |
250009221
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| Publikation (Nr.) |
 copernicus.org/hess-11-875-2007.pdf |
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| Zusammenfassung |
| This paper analyses simple models for "production-utilisation"
systems, reduced to two state variables for
producers and utilisers, respectively. Two modes are distinguished: in
"harvester" systems the resource utilisation involves active seeking on the
part of the utilisers, while in "processor" systems, utilisers function as
passive material processors. An idealised model of biosphere-human
interactions provides an example of a harvester system, and a model of plant
and soil carbon dynamics exemplifies a processor system. The biosphere-human
interaction model exhibits a number of features in accord with experience,
including a tendency towards oscillatory behaviour which in some
circumstances results in limit cycles. The plant-soil carbon model is used
to study the effect of random forcing of production (for example by weather
and climate fluctuations), showing that with appropriate parameter choices
the model can flip between active-biosphere and dormant-biosphere equilibria
under the influence of random forcing. This externally-driven transition
between locally stable states is fundamentally different from Lorenzian
chaos. A behavioural difference between two-component processor and harvester
systems is that harvester systems have a capacity for oscillatory behaviour
while processor systems do not. |
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